The present invention relates to a melanin concentrating hormone antagonist compound of formula (I): wherein R.sup.1, R.sup.a, R.sup.b, R.sup.2, L.sup.1, R.sup.3, R.sup.4 and R.sup.5 are as defined, or a pharmaceutically acceptable salt, enantiomer, diastereomer or mixture of diasteromers thereof useful in the treatment, obesity and related diseases. ##STR00001##