ganglioside GM2 (natural compound)
ganglioside gm2 (natural compound)
"A naturally occurring mixture of ganglioside GM2 analogues having within the ceramide moiety various N-acyl groups, e.g. octadecanoyl (R = -[CH2]16CH3 in the diagram), icosanoyl (R = -[CH2]18CH3),  tetracos-15-enoyl (R = -[CH2]13HC=CH[CH2]7CH3)."