+++thanks_Commander L_1 article from sciencedirect

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Synthesis and mass spectra of 4-O-acetyl-1,5-anhydro-2,3,6-tri-O-ethyl-d-glucitol and the positional isomers of 4-O-acetyl-1,5-anhydro-di-O-ethyl-O-methyl-d-glucitol and 4-O-acetyl-1,5-anhydro-O-ethyl-di-O-methyl-d-glucitol
Carbohydrate Research, Volume 182, Issue 1, 15 October 1988, Pages 53-62
Samuel G. Zeller, Anello J. D'Ambra, Michael J. Rice, Gary R. Gray

DOI:

http://dx.doi.org/10.1016/0008-6215(88)84091-6

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http://www.sciencedirect.com/science/article/pii/0008621588840916