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note
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Note that there are many more substituents than molecules because any one molecule gives rise to several substituents because the attachement point behaves as a virtual atom. For example toluene (methylbenzene) gives four possible substituents: alpha-tolyl, ortho-tolyl, meta-tolyl, and para-tolyl.
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Many small-ring combinations are highly strained and unstable, such as tetrahedrane or prismane. Compounds containing multiple cyclopropanes are known, but their number is insignificant compared to the combinatorial possibilities. For a striking example of molecules with multiple cyclopropanes, see A. de Meijere, M. von Seebach, S. Zöllner, S. I. Kozhushkov, V. N. Belov, R. Boese, T. Haumann, J. Benet-Buchholz, D. S. Yufit, J. A. K. Howard, Chem. Eur. J. 2001, 7, 4021-4034.
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16
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16244373318
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note
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3.3 graph as a subgraph. Tricyclic bridgeheads occur in tricyclo[2.2.2.2]decane and related compounds, and are highly distorted.
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18
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16244418628
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note
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Unstable combinations include: bridgehead olefins, bonds between heteroatoms (except in hydrazones, oximes, nitro, and in certain aromatic heterocycles), acyl halide, enamines, acyclic imines, enols, hemiacetals, orthoesters, and similar hydrolytically labile functions. Triple bonds were not used except for nitriles, and allenes were not used.
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20
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0024664539
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16244364715
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c) http://www.mol-net.de/index.html.
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24
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16244398001
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note
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Tricyclo[3.3.3.0]undecane is present in Rdb as 1-Aza-tricyclo[3.3.3.0] undecane and 1,5-diaza-tricyclo[3.3.3.0]undecane.
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25
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16244381085
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http://dtp.nci.nih.gov/index.html
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26
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16244411600
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http://www.camsoft.com.
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27
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16244414581
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note
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A ring type is a graph not containing any node of connectivity 1. The Chemical Abstracts Registry or Beilstein databases are suitable for comparison. A simple total count comparison would be of little value since many entries in these databases correspond to isotopic combinations and salts of the same compounds, and sometimes to theoretical molecules that have never been synthesized.
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29
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0034609833
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34
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16244421965
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Sets of active and inactive compounds for a specific drug target serve as an input for this application. After fragmentation of those compounds a pharmacophore model is created which is able to give an activity score for unknown compounds, http://www.molinspiration.com
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