Compounds of formula (Ia): ##STR00001## where x, y, G, L, M, W, R.sup.2, R.sup.3, R.sup.5, R.sup.5a, R.sup.6, R.sup.6a, R.sup.7, R.sup.7a, R.sup.8 and R.sup.8a are defined herein, are disclosed, as well as pharmaceutical compositions comprising the compounds. These compounds and pharmaceutical compositions are useful in treating SCD-mediated diseases or conditions.