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Gingrich, Diane E.; Reddy, Dandu R.; Iqbal, Mohamed A.; Singh, Jasbir; Aimone, Lisa D.; Angeles, Thelma S.; Albom, Mark; Yang, Shi; Ator, Mark A.; Meyer, Sheryl L.; Robinson, Candy; Ruggeri, Bruce A.; Dionne, Craig A.; Vaught, Jeffry L.; Mallamo, John P.; Hudkins, Robert L. . (2003). A New Class of Potent Vascular Endothelial Growth Factor Receptor Tyrosine Kinase Inhibitors:  Structure−Activity Relationships for a Series of 9-Alkoxymethyl-12-(3-hydroxypropyl)indeno[2,1- <i>a</i> ]pyrrolo[3,4- <i>c</i> ]carbazole-5-ones and the Identification of CEP-5214 and Its Dimethylglycine Ester Prodrug Clinical Candidate CEP-7055. Journal of Medicinal Chemistry, 46(25), 5375–5388. doi:10.1021/jm0301641 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research