Hi and welcome to Basenotes!
What was the name of the perfume that had those notes? And now I have to look up pitahaya fruit....
edit: Beautiful looking fruit! But I'm trying to remember now where I saw an illustration of this fruit only recently. And googling I see there was/is a fragrance with this note: Vanille Pitahaya Comptoir Sud Pacifique for women.
edit again: Was it Victoria's Secret - Exotic Nectars Tahitian Vanilla Flower? I see one on eBay but wow, pricey.