The effects of green tea catechins, (+)- and (-)-catechins (C), (-)-epicatechin (EC), (-)-epicatechin gallate (ECG), (-)-epigallocatechin (EGC), and (-)-epigallocatechin gallate (EGCG), on vascular contractility were investigated in porcine coronary artery. At the concentration of 200 μM, only EGC,