Doxorubicin Hydrochloride → Ethyl 2-{[(3S)-1-({[1-(2-tert.butoxy-2-oxoethyl)-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepin-3-yl]amino}carbonyl)cyclopentyl]methyl}-4-(isopropylamino)-4-oxobutyrate

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With a retention time of 6.5 min., there was obtained 33 g of the second stereoisomer, which was assigned the designation “rel2” in relation to the chiral center “*Ca” bearing the group “—COOR1”, as (2“rel2”)-3-{[1-({[(3S)-1-(2-tert. butoxy-2-oxoethyl)-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepin-3-yl]amino}carbonyl)cyclopentyl]ethyl}4-ethoxy-4-oxobutyric acid, 1H-NMR (CDCl3): 7.31-7.17, m, [3]; 7.11, d, [2]; 6.81, d, [1]; 4.60, 4.56, 4.35, 4.31, AB-Q. [2]; 4.48, m, [1]; 4.10, m, [1]; [α]D=−136° (1% in methanol).

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