| 摘要 |
(A) Urea derivs. of formula (I) and (II), and carbodiimide derivs. of formula (III), are new: R1 = H; R2 = H, alkyl, or alkyl substd. by opt. substd. aryl or heterocyclyl; or NR1R2 is anopt. substd. 5-6C ring; Ar = opt. substd. phenyl or heteroaryl; n = 1-6.
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