What is the molecular formula of the molecule identified by 13-ethenyl-11-methoxy-8,16-bis(phenylmethoxy)-4,19-di(propan-2-yl)-6-oxa-7-azapentacyclo[11.8.0.03,11.05,9.015,20]henicosa-5(9),7,15,17,19-pentaene-10,12,14-trione ?