“…= 0.0100 μM convert to nM). X=CH,N; Ar=4-Cl-Ph, 4-NO 2 -Ph R=H, OCH 3 , N(CH 3 ) R=H, NO 2 ; R 1 =OCH Ph, CH 3 , Ph, 4-Cl-Ph, 4-OCH 3 -PhAnother series of hybrids, viz., 2-pyridyl hexahydrocycloocta[4,5] thieno[2,3-d] pyrimidines (compounds 27), with different substituents at the C-4 position was synthesized by Kassab and Gedawy and tested their in vitro antiproliferative activity against 60 different human tumor cell lines representing leukemia, melanoma, and cancers of the colon, central nervous system, lung, ovary, kidney, prostate including breast[31]. Commonly, compounds carrying pyridyl moiety at the C-2 position were found to have better anti-cancer activity.…”