label: a ganglioside GA2 (d18:1(4E)) + CMP-N-acetyl-beta-neuraminate = a ganglioside GM2 (d18:1(4E)) + CMP + H(+)
label_lc: a ganglioside ga2 (d18:1(4e)) + cmp-n-acetyl-beta-neuraminate = a ganglioside gm2 (d18:1(4e)) + cmp + h(+)