You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E,4E,6E,8E,10E,12E,14E)-2,6,11,15-tetramethyl-16-oxo-16-[(2S,4S,5S)-3,4,5-trihydroxy-6-[[(2R,4S,5S)-3,4,5-trihydroxy-6-[[(E)-3-[4-hydroxy-3-(hydroxymethyl)-5-methoxyphenyl]prop-2-enoyl]oxymethyl]oxan-2-yl]oxymethyl]oxan-2-yl]oxyhexadeca-2,4,6,8,10,12,14-heptaenoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C43H54O18
assistant