THE CHEMICAL ABSTRACTS SERVICE GENERIC CHEMICAL (MARKUSH) STRUCTURE STORAGE AND RETRIEVAL CAPABILITY .1. BASIC CONCEPTS

被引:50
作者
FISANICK, W
机构
[1] Chemical Abstracts Service, Columbus, OH 43210
来源
JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES | 1990年 / 30卷 / 02期
关键词
D O I
10.1021/ci00066a008
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The concepts and strategies presented in this paper provide a new way of viewing and representing chemical structures for both specific and generic substances. Groups such as ethyl and phenyl have generic group nodes in the connection tables as alternatives to their specific atom designations. A set of 11 generic group nodes is used. The generic group nodes are hierarchical and can be further qualified by attributes such as the carbon range and ring size. Colloquial generic groups such as alkyl and aryl are likewise mapped onto the hierarchical generic group nodes and appropriate attributes. The fragments of variable groups in the input representation are attached to the appropriate portion of the structure as simple alternatives at a designated point of variability. Points of variability are sometimes algorithmically shifted in the structure to simplify further processing. The resulting topological representation enables searching of specific or generic substances with structure queries consisting of all generic groups, all specific atom groups, or any combination of specific atom and generic groups, and with or without expressed variability. © 1990 American Chemical Society.
引用
收藏
页码:145 / 154
页数:10
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