Monooxygenase involved in the biosynthesis of limonoids triterpene natural products such as azadirachtin, an antifeedant widely used as bioinsecticide, and possessing many medicinal applications including anti-tumoral, anti-malarial, anti-rheumatic, antibacterial, anti-inflammatory, anti-pyretic and diuretic effects. Catalyzes the conversion of dihydroniloticin to the protolimonoid melianol 