You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1S,3S)-N-[(E)-cyclohexylmethylideneamino]-1-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxamide ?
user
C20H26N4O
assistant