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. 2004 Jul 31;9(8):694–704. doi: 10.3390/90800694

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© 2004 by MDPI (http:www.mdpi.org).

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3D Model of 5b, showing the different orientations of the hydrogens at C-6. Calculations were performed using the PC GAMESS version [18] of the GAMESS (US) QC package [19].