Abstract: N-containing, condensed heterocyclic compounds and salts thereof are disclosed which are useful for inhibiting squalene synthetase and fungal growth, and which are useful for treating or preventing hyperlipidemia. Also disclosed is a method for producing these compounds.

Abstract: Disclosed is a squalene synthetase inhibitor which comprises the compound represented by the formula ##STR1## wherein R.sub.1 is hydrogen or an optionally substituted hydrocarbon group; R.sub.2 is hydrogen, an optionally substituted alkyl group, an optionally substituted phenyl group or an optionally substituted aromatic heterocyclic ring group; X' is a substituent comprising an optionally esterified carboxyl group, an optionally substituted carbamoyl group, an optionally substituted hydroxyl group, an optionally substituted amino group or an optionally substituted heterocyclic radical having a protonizable hydrogen; Ring A is an optionally substituted benzene ring or an optionally substituted aromatic heterocyclic ring; Ring J' is a 7- to 8-membered heterocyclic ring containing at most three ring constituting hetero atoms; D is C or N; the Ring J' optionally having, besides R.sub.1, R.sub.

Abstract: Disclosed is a squalene synthetase inhibitor which comprises the compound represented by the formula (I) ##STR1## wherein R.sub.1 stands for H or an optionally substituted hydrocarbon group; R.sub.2 and R.sub.3 independently stand for H, an optionally substituted alkyl group, an optionally substituted phenyl group or an optionally substituted aromatic heterocyclic group; Z stands for a carbon chain containing a double bond or --Z'--C(OH)-- (Z' stands for a bond or a straight-chain or branched alkylene chain); the symbol .........

Abstract: There is provided a squalene inhibitory composition containing a 1,1-bisphosphonic acid compound, a lower alkyl ester thereof, or a salt thereof, which is useful for treating hypercholesterolemia. There are also provided novel compounds having squalene synthetase inhibitory activity and a pharmaceutical composition for treating hypercholesterolemia containing a 1,1-bisphosphonic compound, a lower alkyl ester thereof or a salt thereof.