methylidene
plural of Copelin
(organic chemistry) The CH₂= group in which the free valences are part of a double bond.
(US, slang) Of a location, crowded with people.
A scattered settlement in Adderstone with Lucker parish, in northern Northumberland, England (OS grid ref NU1330).
再配列の過程で、メチリデン基(CH2=基)が移動してより安定な共役系を形成した。
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