Помогите ознакомиться со статьей:
Achim Freisleben, Peter Schieberle, and Michael Rychlik, "Syntheses of Labeled Vitamers of Folic Acid to Be Used as Internal Standards in Stable Isotope Dilution Assays", J. Agric. Food Chem., 2002, 50 (17), pp 4760–4768.
- DOI:
http://dx.doi.org/10.1021/jf025571k
