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Figure 1
The mol­ecular structures of (a) compound (I)[link], (b) compound (II)[link], (c) compound (III)[link] and (d) compound (IV)[link], shown as the (2S,4R) form in each case. Displacement ellipsoids are drawn at the 30% probability level.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 9| August 2009| Pages o465-o469
doi:10.1107/S0108270109030339
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