Description: (+)-Bicuculline (BRN-0098786; NSC-32192; BRN0098786; NSC32192), a phthalide-isoquinoline-based natural product isolated from Dicentra cucullaria, is a novel, light-sensitive and competitive antagonist of GABAA receptors with an IC50 of 2 μM. It induces clonic and tonic-clonic seizures after systemic administration.