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Volume 15, Issue 2, Pages 65-98

REGRAS: an auxiliary program for pattern recognition and substructure elucidation of monoterpenes

Marcelo J. P. Ferreira,1 Gilberto V. Rodrigues,2 AntÔnio J. C. Brant,1 and Vicente P. Emerenciano1

1Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, 05513-970 São Paulo, Brazil
2Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 30161-000 Belo Horizonte, Minas Gerais, Brazil

Received 7 October 2000; Revised 5 December 2000

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The main purpose of this paper is to present a procedure that utilizes 13C NMR for pattern recognition and substructure elucidation of monoterpenes. By this reason, a novel version of the REGRAS program was developed for the specialist SISTEMAT system. This program carries out an analysis of the 13C NMR data from a given compound and, from characteristic chemical shift ranges, recognizes the substructures and the skeleton present in a compound. At the end of this procedure, the program displays as analysis results the likely skeletons and substructures of the substance in question. The REGRAS program was tested on skeleton elucidation of 30 monoterpenes from the most varied skeleton types, exhibiting excellent results in skeleton and substructure prediction processes.