tirilazad [ 21-(4-(2,6-di-1-pyrrolidinyl-4-pyrimidinyl)-1-piperazinyl)-16-methylpregna-1,4,9(11)-triene-3,20-dione monomethane sulfonate,Freedox,Pharmacia brand of tirilazad mesylate hydrate,U 74006F,U-74006,U-74006F,U74006F,tirilazad mesylate,tirilazad mesylate hydrate ] a lazaroid; potent inhibitor of iron-dependent lipid peroxidation; has shown excellent activity in in vivo models of experimental central nervous system trauma & ischemia; structure given in first sou