3-Aminopropylisothiuronium 3-Apt 4-04-00-01657 (Beilstein Handbook Reference) 7072-40-4 7320-57-2 APT BRN 1749749 Carbamimidothioic acid, 3-aminopropyl ester (9CI) Pseudourea, 2-(3-aminopropyl)-2-thio- S-(3-Aminopropyl)isothiourea S-(3-Aminopropyl)isothiuronium