the raceme, the (r)-isomer and the (s)-isomer are identical in chemical structural formula but different in stereostructure and optical rotation performance.
外消旋体、(r)-异构体和(s)-异构体具有相同的化学结构式,具有不同的立体结构和旋光性能。
some troublesome problems of computer composing in chemical structural formula have been solved, which are of value of application and dissemination.
the invention discloses an anti-influenza virus prodrug which is a derivative related to 1, 3-pyrazine oxazine-2, 4 diketone with a chemical structural formula (i);