2.
Name: diethyl 4,4,5,5,6,6-hexafluoro-3,7-dioxo-2,8-bis(triphenylphosphoranylidene)nonanedioate
CAS: 60521-76-8



4.
Name: 4H,5H-Pyrano[4,3-b]pyran-4,5-dione,7,7'-(2,- 4-dimethyl-1,3-cyclobutanediyl)bis[2,3- dihydro-3-hydroxy-2-methyl-
CAS: 140671-26-7


