在确定一个化合物的结构式之前，首先应知道它的分子式。
Before we can assign a structural formula to a compound, we must first know its molecular formula.
根据申报表项填写情况，申报物质有唯一确定的分子结构，所以应准确填写申报物质的分子式和分子量。
To provide the molecular formula and molecular weight, as the substance has a unique and defined molecular structure according to item III of your notification form.
凡具相同分子式但不同结构式的物质称为异构体。
Substances which have identical molecular formulas but different strucural formulas, are known as isomers.
本文运用IR、NMR、MS等分析测试手段，研究了2-甲基咪唑和水杨酸与锌的络合物的分子式和结构式。
The formula and structural formula as to complex compound which was formed by reaction of 2-methylimidazole, O-hydroxybenzoic acid and zinc have been stud. ed by using IR, NMR, and MS.
本文运用IR、NMR、MS等分析测试手段，研究了2-甲基咪唑和水杨酸与锌的络合物的分子式和结构式。
The formula and structural formula as to complex compound which was formed by reaction of 2-methylimidazole, O-hydroxybenzoic acid and zinc have been stud. ed by using IR, NMR, and MS.
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