You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [1-[(5Z,8Z,11Z,14Z,17Z)-icosa-5,8,11,14,17-pentaenoxy]-3-[3,4,5-trihydroxy-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxypropan-2-yl] heptadecanoate .
user
C52H90O14
assistant