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 4-N-[(1S)-1-(1-chloro-8-methyl-4a,5-dihydroisoquinolin-3-yl)ethyl]-5-(ethylideneamino)-3,6-dimethyl-4,5-dihydropyrimidine-4,6-diamine .
user
C20H29ClN6
assistant