1,3,4-Methano-1H-cyclobuta(cd)pentalene-2-pentanoic acid, 1,1a,3,3a,4,5,5,5a,5b,6-decachlorooctahydro-2-hydroxy-gamma-oxo-, ethyl ester 1,3,4-Metheno-1H-cyclobuta(c,d)-pentalene-2-levulinic acid, 1,1a,3,3a,4,5,5a,5b,6-decachlorooctahydro-2-hydroxy-, ethyl ester 4234-79-1 AI3-27154 Allied GC 9160 Caswell No. 436C Despirol Ethyl 1,1a,3,3a,4,5,5a,5b,6-decachlorooctahydro-2-hydroxy-1,3,4-metheno-2H-cyclobuta(cd) pentamethylene-2-levulinate GC 9160 General chemical 9160 General chemicals 9160 KELEVAN