methenyl


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methenyl

[′meth·ə‚nil]
(organic chemistry)
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1HNMR spectrum of the ligand H2A exhibits methyl (CH3) protons at 2.33 ppm, methoxyl (CH3O) protons in pyridazine ring at 3.92 ppm, methenyl (-CH=) proton at 6.10 ppm, and phenyl and pyridazinyl protons at 7.18-8.03 ppm, whereas the NH proton is unobserved.
In addition, different one-carbon substituents can be present, including methyl and formimino groups at position N-5, formyl groups at either N-5 or N-10, or a methenyl or methylene bridge that connects these 2 positions (1).
However, a glutamate (E) paired with an aspartate (D) will still give a player 2 points (the only difference between these two amino acids is a methenyl group (CH2) in the side chain).

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