Аминоизовалериновая кислота
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https://himija-online.ru/wp-content/uploads/2018/01/%D0%B0%D0%BA_%D0%BE%D1%81%D1%82%D0%B0%D1%82%D0%BA%D0%B8-%D0%B2%D1%85%D0%BE%D0%B4%D1%8F%D1%82-%D0%B2-%D1%81%D0%BE%D1%81%D1%82%D0%B0%D0%B2-%D0%B1%D0%B5%D0%BB%D0%BA%D0%BE%D0%B2.jpg