(9Z)-17-[(O-beta-D-glucosyl-(1->2)-beta-D-glucosyl)oxy]-octadecenoate-beta-D-glucosyl-(1->2)-beta-D-glucoside = (9Z)-17-[(beta-D-glucosyl-(1->2)-beta-D-glucosyl)oxy]-octadec-9-eno-1,4''-lactone + beta-sophorose — reaction