You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9R,10S)-10-hydroxy-12-(hydroxymethylidene)-4-methoxy-17-methyl-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-trien-13-one by IUPAC nomenclature, provide its molecular formula.
user
C19H23NO4
assistant