Detection and structural characterization of ras oncoprotein-inhibitors complexes by electrospray mass spectrometry - Ganguly, AK; Pramanik, BN; Huang, EC; Liberles, S; Heimark, L; Liu, YH; Tsarbopoulos, A; Doll, RJ; Taveras, AG; Remiszewski, S (Bioorganic & medicinal chemistry, 1997)