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