Before we can assign a structural formula to a compound, we must first know its molecularformula.
在确定一个化合物的结构式之前，首先应知道它的分子式。
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The average condensed formula of molecular structure is effective to derive the composition of the peripheral substituents of porphyrins, especially geoporphyrins with identical carbon numbers.
On the basis of production practice, the reaction mechanism of highly efficient aliphatic water reducer was analyzed in-depth, its molecularformula was put forward.