5-Heptenoic acid, 7-(3-(3-hydroxy-1-octenyl)-2,6-dioxabicyclo(3.1.1)hept-4-yl)-, (1S-(1alpha,3alpha,3R*),4beta(Z),5alpha)- 57576-52-0 Rabbit aorta contracting substance THROMBOXANE A2 TXA-2 Thromboxa-5,13-dien-1-oic acid, 9,11-epoxy-15-hydroxy-, (5Z,9alpha,11alpha,13E,15S)-