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axis.  The location of the methyl carbon C33 bonded to N8 (which lies on the twofold axis) is not correct as methyl C33 is only 1.47(3) Å from the symmetry-related C33* at (1-x, y,  3/2-z) and the "tetrahedral" C33-N8-C33* angle is only 57¡ã
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