| 摘要 |
<p>1,226,250. Urea derivatives. FARBENFABRIKEN BAYER A.G. 7 Nov., 1969 [22 Nov., 1968], No. 54659/69. Heading C2C. [Also in Division A5] The invention comprises compounds of the formula where R is an alkyl or aryl radical which may be substituted. The compounds are prepared by reacting together compounds of the formula</p> |
