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... 2. A study was made of the effect of S-  methylation 
Tautomerism and geometric isomerism of nitrogen containing derivatives of carbonyl compounds
Tautomerism and geometric isomerism of nitrogen containing derivatives of carbonyl compounds
Kitaev, Yu. P.; Budnikov, G. K.; Chernova, A. V.
on the ultraviolet spectra of the ...
... L-valines by their tosylation, subsequent  methylation 
Depsipeptides
Depsipeptides
Ovchinnikov, Yu. A.; Ivanov, V. T.; Kiryushkin, A. A.
with methyliodide, and removal of the ...
... chains (or of incomplete structures —  methylation 
Factors determining the biosynthesis of griseofulvin and similar substances
Factors determining the biosynthesis of griseofulvin and similar substances
Vaněk, Z.; Souček, M.
, reduction, with possible subsequent ...
... or removal of a hydroxyl group or by  methylation 
Anthocyanins and their Sugar Components
Anthocyanins and their Sugar Components
Harborne, J. B.
or glycosylation. ...