4-Hydroxy-2-quinolones 172*. Synthesis and structure of 4,3'-spiro[(6-allyl-2-amino- 5-oxo-5,6-dihydro-4h-pyrano- [3,2-c]quinoline-3-carbo- nitrile)-2'-oxindole]
/ I. V. Ukrainets , R. G. Red’kin, L. V. Sidorenko and A. V. Turov
// Chemistry of Heterocyclic Compounds
Volume 45 (2009), Number 12, pages 1478-
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http://dx.doi.org/10.1007/s10593-010-0454-9