You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,8S,9S,11S)-8-(dimethylamino)-13-(hydroxymethyl)-4-phenylmethoxy-6,14-dioxa-5-azatetracyclo[9.2.1.01,9.03,7]tetradeca-3(7),4,12-trien-2-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N2O5
assistant