GO:0051264

Catalysis of the reaction: mono-olein + mono-olein = diolein + glycerol. Mono-olein, also known as mono-oleoylglycerol, is the monoglyceride formed from oleic acid, 9-octodecenoic acid; diolein is also known as dioleoylglycerol. [GOC:ai, PMID:15364929]