label: a 1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol + CMP-N-acetyl-beta-neuraminate => a 1,2-diacyl-3-[3-(N-acetyl-alpha-D-neuraminyl)-beta-D-galactosyl]-sn-glycerol + CMP + H(+)
label_lc: a 1,2-diacyl-3-o-(beta-d-galactosyl)-sn-glycerol + cmp-n-acetyl-beta-neuraminate => a 1,2-diacyl-3-[3-(n-acetyl-alpha-d-neuraminyl)-beta-d-galactosyl]-sn-glycerol + cmp + h(+)