Showing structure for methyl 3-[(2r,6r)-1-hydroxy-5,5,13-trimethyl-3,14-dioxo-4,13-diazatetracyclo[6.6.1.0²,⁶.0¹²,¹⁵]pentadeca-8,10,12(15)-trien-4-yl]-3-oxopropanoate