7 [3 (4 acetyl 3 hydroxy 2 propylphenoxy) 2 hydroxypropoxy] 4 oxo 8 propyl 4h 1 benzopyran 2 carboxylic acid Animal Aspirin Bladder Catechols Comparative Study Guinea Pigs In Vitro Leukotriene B4 Male Muscle Contraction Nordihydroguaiaretic Acid Rats Rats, Inbred Strains SRS-A Support, Non-U.S. Gov't acetylsalicylic acid animal cell bladder contraction detrusor muscle dose response drug administration drug comparison drug efficacy drug response guinea pig in vitro study inotropism leukotriene