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The title synthetic analog of purine nucleosides, C16H16Cl2N4O7, has its acetyl­ated β-furan­ose ring in a 3′β-envelope conformation, with the corresponding C atom deviating by 0.602 (5) Å from the rest of the ring. The planar part of the furan­ose ring forms a dihedral angle of 65.0 (1)° with the mean plane of the purine bicycle. In the crystal, mol­ecules form a three-dimensional network through multiple C—H...O and C—H...N hydrogen bonds and C—H...π interactions.

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The title compound, C44H62O6S2 {systematic name: (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-5a,5b,8,8,11a-penta­methyl-1-(prop-1-en-2-yl)-3a-[(tos­yloxy)meth­yl]icosa­hydro-1H-cyclo­penta­[a]chrysen-9-yl 4-methyl­benzene­sulfonate}, was obtained by tosyl­ation of naturally occurring betulin. All the cyclo­hexane rings adopt chair conformations and the cyclo­pentane ring adopts a twisted envelope conformation, with the C atom bearing the tosyl­methyl substituent forming the flap. In the crystal, mol­ecules form a three-dimensional network through multiple weak C—H...O hydrogen bonds.
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