You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(6Z,9Z,12Z,15Z)-octadeca-6,9,12,15-tetraenoyl]oxy-3-[(9Z,12Z,15Z)-octadeca-9,12,15-trienoyl]oxypropyl] (6Z,9Z,12Z,15Z,18Z,21Z)-tetracosa-6,9,12,15,18,21-hexaenoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C63H96O6
assistant