In Vitro Cellular Activities of 21.

aCancer cells were purchased from Nanjing KeyGen Biotech Co. Ltd, and subcultured by State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University.bThe description was abstracted by the reference [27].cAntiproliferative activity was measured using the WST-1 assay. Values are the average of two independent experiments run in triplicate. Variation was generally 5%.dNSCLC: non-small-cell lung cancer.