Ciguatoxin CTX 3C

(2R,2'Z,4a'S,5a'R,6a'S,7a'R,8a'S,9a'R,10'S,11'S,13a'S,14'S,15'S,15a'R,16a'S,18'R,19a'R,20a'S,21'R,22a'R,23a'S,26a'R,27a'S,28a'R,29a'S,34a'R,35'R,35a'S,36a'R,38a'S,39a'R) -10',11',15',18',20a'-pentamethyl-1',4,4',4a',5,5a',6',6a',7a',8',8a',9a',10',11',13a',14',15',15a',16a',17',18',19',19a',20a',21',22',22a',23a',26',26a',27a',28',28a',29a',30',33',34a',35',35a',36a',38a',39a'-dotetracontahydro-3H-spiro[furan-2,12'-oxepino[2'''',3'''':5''',6''']pyrano[2''',3''':5'',6'']pyrano[2'',3'':6',7']oxepino[2',3':7,8]oxocino[3,2-b]pyrano[2''''',3''''':6'''',7'''']oxepino[2'''',3'''':5''',6''']pyrano[2''',3''':7'',8'']oxocino[2'',3'':5',6']pyrano[2',3':6,7]oxepino[2,3-h]oxonine]-14',21',35'-triol