((3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl)oxy)acetaldehyde 72928-15-5 Acetaldehyde, ((3a,4,5,6,7,7a-hexahydro-4,7-methano-1H-inden-5-yl)oxy)-