You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 11-[6-(2-cyclohexa-1,5-dien-1-yl-6-hepta-1,3,5-trien-3-yl-1-methylpyridin-1-ium-4-yl)-9-phenyl-4b,8a-dihydrocarbazol-3-yl]-14-ethylidene-N-methyl-13-methylideneoctadeca-2,4,6,9,11,15-hexaen-17-yn-9-amine into molecular formula.
user
C59H60N3+
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