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28 dic 1864 anni - Кекуле предложил циклическую структурную формулу бензола, имеющую вид правильного шестиугольника
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By
Анастасия Парыгина
15 giu 2017
0
0
839
Data:
28 dic 1864 anni
Adesso
~ 159 years ago
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