Synthesis and physical properties of various organic dyes derived
from a single core skeleton, 1,2-dihydroindol-3-one
Shoji Matsumoto *, Daisuke Samata, Motohiro Akazome, Katsuyuki Ogura
Tetrahedron Letters, 2009, vol. 50, # 1, p. 111 - 114
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http://dx.doi.org/10.1016/j.tetlet.2008.10.098