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sequence rule
Molecular formula :
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CAS :

nature : the substituents sequence of rules. Include (1) single-atom substituents ranked by the size of atomic number, organic compounds common element in its chronological order : I>Br>Cl>S>P>F>O>N>C>D>H the isotope, high-quality big order; (2) If more than two atomic groups of a similar atoms, it is more connected with other atoms, in comparison, the atomic number by the order, if still the same, along Successive compared to replace chain; (3) containing double bonds or three keys to the group, that not even have two or three of the same atom; (4) If less than four atoms bond can be added at atomic number zero (the order in the last row), "imaginary atomic" so that they will reach 4, in some skeleton fixed oxygenated compounds, nitrogen, "Solitary electronic" commits in such a situation.


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