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For example, upon superimposing the steroidal backbone of 1-I with that of the lowest energy conformer of the corresponding 17β-hydroxy 10-azasteroid. the rms value is only 0.081 Å. A similar small value (0.088 Å) is obtained by superposition of 1-I with the global minimum of the corresponding 17β-N-tert-butylcarbamoyl derivative. In both cases, the D ring distorsion contributes to a great extent to these rms fitting values.
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