The present invention relates to the compound represented by formula (I) ##STR00001## (wherein R.sup.1 and R.sup.2 is hydrogen atom, C1-8 alkyl etc.; R.sup.3 is C1-8 alkyl which may be substituted with 1 to 3 halogen atom(s), phenyl; R.sup.4 is hydrogen atom etc.; R.sup.5 and R.sup.6 is hydrogen atom, C1-8 alkyl etc.; X is sulfur atom or oxygen atom etc.; ringA is cyclic group which may have a substituent(s).), or a salt thereof. Toxicity of the compound represented by formula (I) is very low, and it is safe enough to use as a pharmaceutical agent and since it has PPAR .delta. agonistic activity, it is useful as preventive and/or therapeutic agent for glucose.cndot.lipid metabolic disorder, hypertension, circulatory diseases etc.