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APPENDIX 2 - CHEMICAL CLASSES

In October 1997 the chemical class system was simplified. For more information, see *CLASS in Chapter 7 of Volume 2.

                                      Percentage of Database
    1    Carbohydrates                         1.5%
    2    Nucleosides & nucleotides             0.7%
    3    Amino-acids, peptides & complexes     2.9%
    4    Porphyrins, corrins & complexes       1.1%
    5    Antibiotics                           0.6%
    6    Steroids                              1.2%
    7    Terpenes                              1.6%
    8    Alkaloids                             1.0%
    9    Miscellaneous natural products        0.9%
    10   Supramolecular entities               3.0%
    11   High polymers                         0.1%


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