What I smell here is a powerful structure of oud and opium. By opium I mean precisely the smell of the opium poppy's sap. Might be the oregano or the "oud smoke" (don't really know what it is) in the list of notes, but I smell opium.
Frankincense, labdanum, sandalwood and patchouli just dance around this intoxicating skeleton, making for one of the most extraordinary fragrances I've ever tried. Yhink of De Niro smoking opium Once upon a Time in America and mixh the smell in the air with the fragrance he might have wore there, and you get Interlude. Big thumbs up!