3,4-Dihydroxy-5-methoxybenzoic acid 2-(aminoiminomethyl)hydrazide sulfate (2:1) 3,4-Dihydroxy-5-methoxybenzoyl aminoguanidine hemisulfate 35607-26-2 BENZOIC ACID, 3,4-DIHYDROXY-5-METHOXY-, 2-(AMINOIMINOMETHYL)HYDRAZIDE, SULFATE ( Benzoic acid, 3,4-dihydroxy-5-methoxy-, 2-(aminoiminomethyl)hydrazide, sulfate (2:1) (salt)