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28 Dez 1864 Jahr - Кекуле предложил циклическую структурную формулу бензола, имеющую вид правильного шестиугольника
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By
Анастасия Парыгина
15 Jun 2017
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0
837
Datum:
28 Dez 1864 Jahr
Jetzt
~ 159 years ago
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