You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 3-O-ethyl 5-O-methyl 2-(2-aminoethoxymethyl)-4-(1-chlorocyclohexa-2,4-dien-1-yl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate ?
user
C20H27ClN2O5
assistant