ChEBI: Alpha-Neu5Ac-(2->3)-[beta-D-Gal-(1->3)-beta-D-GalNAc-(1->4)]-beta-D-Gal-(1->4)-beta-D-Glc-(1<->1')-N-stearoylsphingosine 1(II'),2(II) lactone is a sialotetraosylceramide consisting of the disialoganglioside GM1 with a lactone ring formed between C-1 of the NeuNac residue and C-2 of the galactose residue proximal to the ceramide moiety. It is a sialotetraosylceramide and a lactone. It is functionally related to a ganglioside GM1.