142506-73-8 O-(3,4-O-Hexadecylidene-beta-D-galactopyranosyl)-(1-1)-2-amino-4-octadecene-1,3-diol Plasmalopsychosine A beta-D-Galactopyranoside, 2-amino-3-hydroxy-4-octadecenyl 3,4-O-hexadecylidene-, (R-(R*,S*-(E)))-