You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [10-[4-(2,3,7,8,12,13,17,18-octaethyl-23,24-dihydroporphyrin-5-yl)buta-1,3-diynyl]-21,24-dihydroporphyrin-5-yl]methanol into its molecular formula.
user
C61H60N8O
assistant