You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 10-ethyl-1-hydroxy-14-methyl-3-(4-methyl-5-oxooxolan-2-yl)-12-oxa-4-azatetracyclo[7.6.1.04,16.011,15]hexadec-9(16)-en-13-one by IUPAC nomenclature, provide its molecular formula.
user
C22H31NO5
assistant