Patent US4603130 - 1-substituted-2-(piperazinyl or homopiperazinyl)-benzimidazole compounds and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsNovel benzimidazole derivatives of the formula: ##STR1## wherein R1 is a lower alkyl group, a lower alkenyl group or a lower alkynyl group, R2 is hydrogen atom, a lower alkyl group or a lower