123594-64-9 2H,5H-(1)Benzopyrano(4,3-b)-1,4-oxazin-9-ol, 3,4,4a,10b-tetrahydro-4-propyl-, (4aR,10bR)-rel- 2H,5H-(1)Benzopyrano(4,3-b)-1,4-oxazin-9-ol, 3,4,4a,10b-tetrahydro-4-propyl-, trans-(+-)- 3,4,4a,10b-Tetrahydro-4-propyl-2H,5H-(1)benzopyrano(4,3-b)-1,4-oxazin-9-ol PBPO PBTO PD 128907 trans-(+-)-3,4,4a,10b-Tetrahydro-4-propyl-2H,5H-(1)benzopyrano(4,3-b)-1,4-oxazin-9-ol