The Aristolochic acid reference article from the English Wikipedia on 24-Jul-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Aristolochic acid

Sponsor with the world's largest charity for orphans
Aristolochic acid is a rodent carcinogen found in Aristolochia species and in Asarum species, both in the Aristolochiaceae family of plants. Aristolochic acid occurs in two forms, aristolochic acid I and aristolochic acid II.