Stable label analogues of methotrexate (MTX) and 7-hydroxymethotrexate (7-OH-MTX) were required for use as internal standards for LC/MS quantitation. A minimum incorporation of stable isotopes to produce a mass increase of 3 in the non-glutamate derived portion of the molecule was necessary for adeq
Synthesis of C7-2H2 steroids for human metabolism studies
โ Scribed by Ian A. Blair; George Phillipou; Christopher Seaborn
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- French
- Weight
- 436 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
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UV absorption spectra of i-&H, and i-C,H70Z radicals have been obtained following pulse radiolysis of Hz/&H6 and H&HdOr mixtures at a total pressure of 1 atm at room temperature. The i-C3H7 spectrum shows two absorption maxima with t( 233 nm) =89Of. 130 M-' cm-' and ~(205 nm) =780+ 120 M-' cm-', res
## Abstract A synthetic route to isotopically labelled forms of the tropane alkaloid hyoscyamine, including (__RS__)โ[3โฒ, 3โฒ,โ^2^H~2~]โ (**2a**) and (__RS__)โ[1โฒโ^13^C, 3โฒ, 3โฒ,โ^2^H~2~]โ (**2b**) hyoscyamines, involving the reaction between phenylacetyl tropine and formaldehyde is described. The is