2,3-Diphenylthiirene 1,1-dioxide 2,3-Diphenylthiirene 1-oxide 2,3-Diphenylthiirene dioxide 5162-99-2 Diphenylthiirene 1,1-dioxide Diphenylthiirene dioxide NSC109950 Stilbene, .alpha.,.alpha.'-epithio-, S,S-dioxide Thiirene, diphenyl-, 1,1-dioxide