156980-57-3 5,11-Methanofuro(3,4-d)(3)benzoxonin-1,12(3H,5H)-dione, 6,6a,7,8,9,10,10a,11-octahydro-6,6a-dihydroxy-11,13-dimethyl-3-methylene-, (5R-(5R*,6S*,6aR*,10aR*,11S*,13R*))- Tetrodecamycin