organic molecular entity 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene C16H8Cl4N2O2 C1=CC(=CC=C1OC2=C(C=C(C=N2)Cl)Cl)OC3=C(C=C(C=N3)Cl)Cl CAS:76150-91-9 PubChem CID:5382 TCPOBOP