1,3-Bis(3-carboxypropyl) thiourea 4-04-00-02606 (Beilstein Handbook Reference) 7256-00-0 BRN 1712862 Butyric acid, 4,4'-(thioureylene)di- (8CI) NSC 74704 USAF MS-1 Urea, 1,3-bis(3-carboxypropyl)-2-thio-