the compound represented by the general formula [II] contains at least one group having the phosphate group of formula (4) or (5); and ##STR21## wherein R3 represents an alkyl or alkenyl group having 1 to 20 carbon atoms, A' represents an alkyl or alkenyl group having 1 to 20 carbon atoms, X3 is a group represented by a formula --P(???O)(OH)2, and i is an integer of 1 to 10. 3.