Spiro[cyclopropane-1,2'(1'H)-phenanthrene]-2-carboxaldehyde,3',4'b,5',6',8'a,9'-hexahydro-4',9'-dihydroxy-4'b,7',8'-trimethyl-1',3'-dioxo-,[2'R-(2'a,4'bb,8'aa,9'b)]-