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 (Z)-7-[(1R,2R,3R,5R)-5-chloro-2-[(E,4S)-4-(1-ethylcyclobutyl)-4-hydroxybut-1-enyl]-3-hydroxycyclopentyl]-2-[ethyl(octadecyl)amino]-2-(2-oxoethyl)hept-5-enoic acid .
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