| 摘要 |
A compound of the formula: wherein X' is nitrogen or carbon bonded to a substituent species characterized as having a sigma m value greater than 0, less than 0 or 0; X is nitrogen or carbon bonded to a substituent species characterized as having a sigma m value equal to 0; A, A' and A'' are individually substituent species characterized as having a sigma m value greater than 0, less than 0 or 0; Z' is a substituent other than hydrogen; j is an integer from 0 to 5; and the wavy line in the structure indicates that the compound can exist in the form of an enantiomer or a diasteromer; Z'' is hydrogen or a substituent other than hydrogen; Y is C=O, C(OH)R' or C-A, where R' is hydrogen or lower alkyl is provided. |
