Compounds having formula (I) ##STR00001## or a pharmaceutically acceptable salt, prodrug, or salt of a prodrug thereof, wherein L, A, G, R.sup.1, R.sup.2 and R.sup.3 are as defined herein. These compounds are particularly useful in the treatment of pain, inflammatory hyperalgesia, and urinary dysfunctions, such as bladder overactivity and urinary incontinence.