139643-79-1 3H,21H-19a,22-Metheno-1H-thieno(3,4-e)(1)benzoxacycloeicosin-3-acetic acid, 3a,4,5,8,9,10,15,15a,18,19,23,23a-dodecahydro-9,24-dihydroxy-4,17,18-trimethyl-alpha,21,23-trioxo- 3a,4,5,8,9,10,15,15a,18,19,23,23a-Dodecahydro-9,24-dihydroxy-4,17,18-trimethyl-alpha,21,23-trioxo-3H,21H-19a,22-metheno-1H-thieno(3,4-e)(1)benzoxacycloeicosin-3-acetic acid Tetronothiodin