2,5-dihydrothiophene 1,1-dioxide 2,5-dihydrothiophene-1,1-dioxide 3-sulfolene 77-79-2 InChI=1/C4H6O2S/c5-7(6)3-1-2-4-7/h1-2H,3-4H butadiene sulfone thiophene, 2,5-dihydro-, 1,1-dioxide