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Beilstein J. Org. Chem. 2011, 7, 1003–1006, doi:10.3762/bjoc.7.113
Graphical Abstract
Scheme 1: Preparation of 1-(cyclopropyl)cyclopropylamine hydrochloride (4·HCl).
Figure 1: Structure of 1,3-di(bicyclopropyl)urea (5) in the crystal [26].