Molecular recognition: a simple dinaphthyridine receptor for urea
1
TetmhedmnLaters, Vol. 38, No. 14, 2391, 1997 Ekvim ScienceLtd Printed in Great Britain C S M M r a d Tetrahedron Letters, 1 S e 2 3 r S S N p a m s Tetrahedron Letters, 9 4 f r r A p S K T Synthesis 1991, 1 K Synthesis 1993, 229-232. K Synthesis 1994,445456. P K r 2391