J. HETEROCYCL. CHEM., 1995, Volume 32, pp. 1-11
Synthesis of 1,3-Dihydro-3,3-dimethyl-2H-indol-2-one Derivatives as Possible Nonsteroidal Cardiotonics
An-Rong Lee [a], Wen-Hsin Huang [a], Tung-Liang Lin [a], Kun-Min Shih [a], Hsiao-Feng Lee [a], Cheng-I Lin
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https://www.jhetchem.com/cd2html.php?file=19950001