What is the molecular formula of the compound with this IUPAC name (5R,6R,7R)-2-N-(2,6-dimethylphenyl)-7-ethyl-3-(2-hydroxyethyl)-4-oxo-2-N,6-N-bis(prop-2-enyl)-6-N-propyl-10-oxa-3-azatricyclo[5.2.1.01,5]decane-2,6-dicarboxamide ?