About N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine
N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine (PubChem CID 160878444) has the molecular formula C331H235B6N23O
and a molecular weight of 4615.55 g/mol. Its IUPAC name is N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine.
Frequently Asked Questions
What is the IUPAC name of N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine?
The IUPAC name of N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine (CID 160878444) is N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine.
What is the SMILES notation for N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine?
The canonical SMILES for N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine is Cc1ccc(N2c3cc(N(c4ccccc4)c4ccc5c(c4)c4ccccc4n5-c4ccccc4)ccc3B3c4ccccc4N(c4ccccc4)c4cccc2c43)cc1.Cc1ccc(N2c3ccc(C)cc3B3c4ccc(N(c5ccccc5)c5ccc6c(c5)c5ccccc5n6-c5ccccc5)cc4N(c4ccccc4)c4cccc2c43)cc1.Cc1ccc(N2c3ccc(C)cc3B3c4ccc(N(c5ccccc5)c5cccc6c7ccccc7n(-c7ccccc7)c56)cc4N(c4ccc(-c5ccccc5)cc4)c4cccc2c43)cc1.Cc1ccc(N2c3ccc(C)cc3B3c4ccc(N(c5ccccc5)c5cccc6c7ccccc7n(-c7ccccc7)c56)cc4N(c4ccccc4)c4cccc2c43)cc1.c1ccc(N(c2ccc3c(c2)N(c2ccccc2)c2cccc4c2B3c2ccccc2N4c2ccccc2)c2ccc3oc4ccccc4c3c2)cc1.c1ccc(N2c3ccccc3B3c4ccc(N(c5ccccc5)c5cccc6c7ccccc7n(-c7ccccc7)c56)cc4N(c4ccccc4)c4cccc2c43)cc1.
What is the InChIKey of N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine?
The InChIKey is SMSBILONJGPFMM-UHFFFAOYSA-N. The full InChI is InChI=1S/C62H45BN4.2C56H41BN4.C55H39BN4.C54H37BN4.C48H32BN3O/c1-42-28-33-48(34-29-42)65-56-39-30-43(2)40-54(56)63-53-38-37-50(41-60(53)66(58-26-15-25-57(65)61(58)63)49-35-31-45(32-36-49)44-16-6-3-7-17-44)64(46-18-8-4-9-19-46)59-27-14-23-52-51-22-12-13-24-55(51)67(62(52)59)47-20-10-5-11-21-47;1-38-28-31-43(32-29-38)59-50-35-30-39(2)36-48(50)57-47-34-33-44(37-54(47)60(41-18-8-4-9-19-41)52-26-15-25-51(59)55(52)57)58(40-16-6-3-7-17-40)53-27-14-23-46-45-22-12-13-24-49(45)61(56(46)53)42-20-10-5-11-21-42;1-38-25-28-43(29-26-38)60-52-33-27-39(2)35-49(52)57-48-32-30-45(37-55(48)61(42-19-10-5-11-20-42)54-24-14-23-53(60)56(54)57)58(40-15-6-3-7-16-40)44-31-34-51-47(36-44)46-21-12-13-22-50(46)59(51)41-17-8-4-9-18-41;1-38-28-30-42(31-29-38)60-53-27-15-26-52-55(53)56(47-23-12-14-25-51(47)59(52)41-20-9-4-10-21-41)48-34-32-44(37-54(48)60)57(39-16-5-2-6-17-39)43-33-35-50-46(36-43)45-22-11-13-24-49(45)58(50)40-18-7-3-8-19-40;1-5-19-38(20-6-1)56(51-34-17-28-44-43-27-13-15-30-47(43)59(54(44)51)41-25-11-4-12-26-41)42-35-36-46-52(37-42)58(40-23-9-3-10-24-40)50-33-18-32-49-53(50)55(46)45-29-14-16-31-48(45)57(49)39-21-7-2-8-22-39;1-4-15-33(16-5-1)50(36-28-30-47-39(31-36)38-21-10-13-26-46(38)53-47)37-27-29-41-45(32-37)52(35-19-8-3-9-20-35)44-25-14-24-43-48(44)49(41)40-22-11-12-23-42(40)51(43)34-17-6-2-7-18-34/h3-41H,1-2H3;2*3-37H,1-2H3;2-37H,1H3;1-37H;1-32H.
What are the key properties of N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine?
N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine has a molecular weight of 4615.55 g/mol, XLogP of 76.64, 36 rotatable bonds, 0 hydrogen bond donors, and 24 hydrogen bond acceptors.
Where does this data come from?
All data for N-dibenzofuran-2-yl-N,8,14-triphenyl-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N,8-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;18-methyl-14-(4-methylphenyl)-N-phenyl-N-(9-phenylcarbazol-1-yl)-8-(4-phenylphenyl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15(20),16,18-nonaen-5-amine;8-(4-methylphenyl)-N,14-diphenyl-N-(9-phenylcarbazol-3-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine;N,8,14-triphenyl-N-(9-phenylcarbazol-1-yl)-8,14-diaza-1-borapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaen-5-amine is sourced from PubChem (CID 160878444), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).