4-(Butylthio)-3,4-dihydro-2H-benzo[h]thiochromene AIDS-132168 AIDS132168 Butyl 3,4-dihydro-2H-benzo[h]thiochromen-4-yl sulfide NSC625574 {4-Butylthio-3,4-dihydro-2H-naphtho[1,2-b]thiopyran}