A 9H-beta-carboline carrying a methyl substituent at C-1 and a hydroxy group at C-7; major microspecies at pH 7.3. ChEBI: Harmol is a 9H-beta-carboline carrying a methyl substituent at C-1 and a hydroxy group at C-7; major microspecies at pH 7.3. It has a role as an antifungal agent, an apoptosis inducer and an autophagy inducer. It is a harmala alkaloid and an indole alkaloid. It is functionally related to a beta-carboline.