2-octadecanoyl-3-O-(2,4S,6S-trimethyl-2E-tetracosenoyl)-6-O-(2,4S,6S-trimethyl-2E-docosenoyl)-2'-O-(2,4S,6S-trimethyl-2E-tetracosenoyl)-4'-O-(2,4S,6S-trimethyl-2E-docosenoyl)-alpha,alpha-trehalose