4,24-Dioxa-9,22-diazatetracyclo[19.3.1.1.0]hexacosa-10,12,14(26),16,18-pentaene-8,23-dione, 11-chloro-6,21-dihydroxy-12,20-dimethoxy-2,5,9,16-tetramethyl-, (1S,2R,3S,5S,6S,16E,18E,20R,21S) 
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Ansamitocin P0
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O3-de-(N-acetyl-N-methyl-L-alanyl)-maytansine
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(3E,5E,7R,84S)-14-chloro-10t,11c-epoxy-84,12c-dihydroxy-15,7r-dimethoxy-3,9c,11t,15-tetramethyl-(84r'H,86c'H)-15-aza-1(1,3)-benzena-8(4,6)-[1,3]oxazinana-cyclopentadecaphane-3,5-diene-82,14-dione
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(1S,2R,3S,5S,6S,16E,18E,20R,21S)-11-Chloro-6,21-dihydroxy-12,20-dimethoxy-2,5,9,16-tetramethyl-4,24-dioxa-9,22-diazatetracyclo[19.3.1.1.0]hexacosa-10(26),11,13,16,18-pentaene-8,23-dione
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Maytansinol (7)
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