Spiro[1H-2,10a-ethanophenanthrene-12,3'- [3H-4b,13]methanonaphtho[1',2':6,7]cyclohepta- [1,2-b]pyran]-11-one,4,11'-bis(acetyloxy)-1',- 2,2',3,4,4a,4b,5,5',6,6',6'a,7,7',8,8',8a,9,9',10,10',- 10'a,10'b,11',12',13'-hexacosahydro-2,7,8',13'- tetrahydroxy-4b,