You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,7R,9S,10R,19S,20S)-20-benzyl-7-ethyl-4,22-dihydroxy-9-methyl-13-(methylaminomethyl)-4-oxo-3,5,8,21-tetraoxa-4lambda5-phosphatricyclo[17.2.1.06,10]docosan-16-one;[(1R,7R,9S,10R,20R,21S)-4-hydroxy-7-(hydroxymethyl)-9,21-dimethyl-4,15-dioxo-17-(2-oxopropyl)-3,5,8,22-tetraoxa-4lambda5-phosphatricyclo[18.2.1.06,10]tricosan-23-yl] methyl hydrogen phosphate by IUPAC nomenclature, provide its molecular formula.
user
C54H90NO21P3
assistant