Is next composition feasible in a cream?

Presumably though. Hydroquinone possesses two phenol groups in the parameter. This makes the molecule prone to oxidation certainly in Alcalisch center, which should be avoided. If Hydroquinone is oxidized, this means that other substances may be reduced. Neither Azelaic acid nor triamcinolone are at risk. In order to prevent the oxidation of hydroquinone, the composition usually includes an Antoxidans: a nametabisulfite for the water phase and a BHT or butyl hydroxytoluone for the fat phase. The two phenol functions also make hydroquinone incompatible with Cetomacrogol so that we can appeal to the image base or the hydrophilic anionic cream TMF. This then gives:

hydroquinone Xg Azelaic acid Yg Triamcinolone acetonide Zg Propylene glycol 10ml Nametabisulfite 400mg BHT 400mg Beelerbasis up to 100g