gamma-Monocyclonerolidol (2 isomers), CAS 67656-40-0, is a sesquiterpene alcohol derivative used primarily as a fragrance ingredient that imparts woody–amber nuances with soft floral and slightly citrus-green facets, functioning as a fixative and a “bridge” between top and base notes to enhance diffusion and substantivity in fine fragrances (fougere, chypre, woody-amber, citrus-woody) and in functional perfumery for personal care (soaps, shampoos, shower gels, lotions, deodorants) and home care/air care (laundry detergents, fabric softeners, dish and surface cleaners, air fresheners, candles, reeds, automotive fresheners); it blends well with citral/citrus materials, ionones/terpenes, amber/resins, patchouli, vetiver, and musks to build body, smooth harsh edges, and deliver a clean-warm signature on cleansing bases, and it also serves as an intermediate or reference standard in fragrance R&D; when formulating, assess stability versus light/oxygen/pH/oxidants in the product matrix, verify category-specific use levels under IFRA and local regulations, consult the SDS for hazard management, and store tightly closed in a cool, dry place away from light and oxidants to minimize odor change by oxidation.
