You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4S)-4-(2-hydroxyethyl)-8-[(1R,6R)-3-methyl-6-prop-1-en-2-ylcyclohex-2-en-1-yl]-1,2,3,4-tetrahydroquinoline-5,7-diol by IUPAC nomenclature, provide its molecular formula.
user
C21H29NO3
assistant