Synonyms: a-Amanitin, 1-L-asparticacid-3-[(S)-4-hydroxy-L-isoleucine]-;9,18-(Iminoethaniminoethaniminoethaniminomethano)pyrrolo[1',2':8,9][1,5,8,11,14]thiatetraazacyclooctadecino[18,17-b]indole,cyclic peptide deriv.; Cyclo[L-a-aspartyl-4-hydroxy-L-prolyl-(S)-4-hydroxy-L-isoleucyl-6-hydroxy-2-mercapto-L-tryptophylglycyl-L-isoleucylglycyl-L-cysteinyl],cyclic (4®8)-sulfide, (R)-S-oxide