1758-73-2 23056-93-1 56766-73-5 AIMSA AMINOIMINOMETHANESULFINIC ACID Aminoiminomethanesulphinic acid EINECS 217-157-8 Formamidine sulfinic acid Formamidinesulfinic acid Manofast Methanesulfinic acid, aminoimino- Methenesulfinic acid, aminoimino- NSC 226979 NSC 34540 Thiourea S,S-dioxide Thiourea dioxide