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Thus, a singlet due to the C2H and C3H, and C1H and C4H for 1 and 3, respectively, is observed in their spectra.
These products were distinguished by observing the changes in the chemical shifts of two imidazole C2H and C5H protons with respect to those of free Ac- L-His-Gly dipeptide ([[delta].sub.C2H] = 8.61 and [[delta].sub.C5H] = 7.33 ppm).
Optimized malealdehyde, fumaraldehyde and transition state geometries have C2v, C2h and C1 point group respectively.
The optimized structure of malealdehyde (cis) and fumaraldehyde (trans) has C2V and C2h point group respectively in the gas and different solution phases.
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