Phosphonic acid,[12-chloro-3,6-bis(2-chloroethoxy)-9-(2-chloroethyl)-1,4,7-trimethyl-2,5,8,10-tetraoxa-3,6,9-triphosphadodec-1-yl],9-chloro-2,5-bis(2-chloroethoxy)-1,4-dimethyl-3,6-dioxa-2,5-diphosphanon-1-yl ester,P,P',P'',P''',P''''-pentaoxide