1,3-Diazetidine-2,4-dione, 1,3-bis(4-isocyanato-3-methylphenyl)- 2,4-Dioxo-1,3-diazetidine-1,3-bis(3-methyl-p-phenylene) diisocyanate 2,5-Toluenediisocyanate dimer 68555-56-6 EINECS 271-432-7