1003-04-9 3(2H)-THIOPHENONE, DIHYDRO- 3-Oxo-2,3,4,5-tetrahydrothiophene 3-Oxotetrahydrothiophene 3-Tetrahydrothiophenone 3-Thiacyclopentanone 3-Thiophanone 4,5-Dihydro-3(2H)thiophenone Dihydro-3(2H)-thiophenone Dihydrothiophen-3(2H)-one EINECS 213-698-9 FEMA No. 3266 NSC 241151