Cascalone

Say itKAS-kuh-lohn

Mountain waterfall, watery fruit, clean mineral; no oyster note.

What it is: A molecule made in a lab.
When you smell it: Dry-down: hours later.
What perfumers do with it: A softer, fruitier Calone successor for dewy fresh-water effects without marine harshness
Worth knowing: A white powder that lasts over 600 hours on a smelling strip.
Rules: Limited. IFRA 51 caps it near 0.56% in fine fragrance
Also called: 7-isopropyl-2H-1,5-benzodioxepin-3(4H)-one

Not on the label of any of the 232 perfumes read so far.

Sources