The color and flower-to-pseudobulb ratio don't quite match anosmum to my eyes, though it's definitely in that section. Looks to me more like a hybrid; my "ballpark" guess is Dendrobium Adastra (aphyllum x anosmum) or something very similar, but as with most hybrids you'll probably never get an exact ID. In any case the culture should be pretty much identical to that for anosmum: warm, wet, summers with lots of fertilizer, and cooler, much drier winters with no fertilizer and brighter light.
Very nice plant, whatever it is! This type of Den is very high among my favorite orchids...