1-Butyl-ether-quinghoasu AIDS-008347 AIDS008347 [3R-(3.alpha.,5a.beta.,6.beta.,8a.beta.,9.alpha., 10.alpha.,12.beta.,12aR*)]-Decahydro-10-butoxy- 3,6,9-trimethyl-3,12-epoxy-12H-pyrano[4.3-j]-1,2- benzodioxepin