1-(9Z-octadecenoyl)-2-hexadecanoyl-sn-glycerol + UDP-alpha-D-galactose => 1-(9Z-octadecenoyl)-2-hexadecanoyl-3-beta-D-galactosyl-sn-glycerol + UDP + H(+)
1-(9z-octadecenoyl)-2-hexadecanoyl-sn-glycerol + udp-alpha-d-galactose => 1-(9z-octadecenoyl)-2-hexadecanoyl-3-beta-d-galactosyl-sn-glycerol + udp + h(+)