F. Bellouard, F. Chuburu, Nelly Kervarec, Ludovic Toupet, Smail Triki, et al.. cis-diprotected cyclams and cyclens: A new route to symmetrically or asymmetrically 1,4-disubstituted tetraazamacrocycles and to asymmetrically tetrasubstituted derivatives.
Journal of the Chemical Society - Perkin Transactions 1, 1999, pp.3499--3505.
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