Synonyms: Formosanan;Spiro[3H-indole-3,6'(4'aH)-[1H]pyrano[3,4-f]indolizine],1,2,5',5'a,7',8',10',10'a-octahydro-, [4'aS-(4'aa,5'aa,6'b,10'ab)]-; [4'aS-(4'aa,5'aa,6'b,10'ab)]-1,2,5',5'a,7',8',10',10'a-Octahydrospiro[3H-indole-3,6'(4'aH)-[1H]pyrano[3,4-f]indolizine]