organic compounds
The structures of (E)-6-chloro-3-[2-(4-chlorophenylsulfonyl)ethenyl]-4-chromanone, C17H10Cl2O4S, (E)-6-bromo-3-[2-(4-bromophenylsulfonyl)ethenyl]-4-chromanone, C17H10Br2O4S, and (E)-3-[2-(4-chlorophenylsulfonyl)ethenyl]-6-methoxy-4-chromanone, C18H13ClO5S, display similar bond angles and distances, but differ in the conformations of the ring systems.