A new diphenyl-methane derivative is useful to inhibit agglomeration of blood and is defined by the formula, including a diphenylethylene derivative and a benzophenone oxime ether derivative.
in which R1 and R2 each are hydrogen, hydroxyl or a lower alkoxy, U is = CXY or = N-O-W, X is hydrogen, cyano or -COR6, R6 being hydroxyl or an amino, Y is -R10-COOR3, R3 being hydrogen or a lower alkoxy, R10 being an alkylene having 1 to 3 carbon atoms, straight or branched, -CO-NR4R5, R4 and R5 each being hydrogen, a lower alkyl or a lower arylalkyl, -CH2-NHS02-C6H5 or -C(R8) = NR7, R7 being a lower alkoxy or an aryl, R8 is -VR9, V being oxygen, sulfur or nitrogen, R9 being an alkyl or an aryl, W is -CH2-CO-CH2-COOR13, R13 being hydrogen or a lower alkyl, -CH2-C(=NOR14)-CH2-COOR15, R15 being hydrogen or a lower alkyl, R14 being a lower alkyl, -CH(CN)-(CH2)q-COOR16, R16 being hydrogen or a lower alkyl, q being an integer of 1 to 3, or -(CH2)p-Z, Z being -SH, -SCN or a monovalent group derived from a five- or six-membered ring which may be substituted by a ring having one or more sulfur atoms in the ring, p being 1 or 2. A pharmaceutical composition containing compounds of formula (XX) or their pharmaceutically acceptable salts as active ingredients, and the use of compounds of formula (XX) or their pharmaceutically acceptable salts in the preparation of a medicament for treatment of diseases caused by blood stream disorders are also disclosed.