Table 1.
Properties of duocarmycin model compounds.[49]
| X-ray bond lengths, Å | 19 | 20 | 21 |
|---|---|---|---|
| a | 1.521 | 1.528 | 1.565 |
| b | 1.544 | 1.543 | 1.525 |
| c | 1.390 | 1.415 | 1.428 |
| X-ray dihedral angle χ1 | 21.2° | 34.2° | 86.4° |
| t1/2 (pH 3) | 133 h | 2.1 h | 0.028 h |
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