Core Viewpoint - Heng Rui Medicine's subsidiary, Ruishi Biopharmaceutical Co., Ltd., has received approval from the National Medical Products Administration for clinical trials of the RSS0393 ointment, which is a PDE4 small molecule inhibitor designed to alleviate tissue damage and inflammation [1] Group 1: Product Development - RSS0393 ointment is independently developed by the company and targets atopic dermatitis [1] - The ointment works by inhibiting PDE4 activity in various cells, which helps in reducing inflammation [1] - The total R&D investment for the RSS0393 ointment project has reached approximately 28.5 million yuan [1] Group 2: Market Context - Competing products in the market include ARCUTIS's roflumilast cream (ZORYVE®), Pfizer's crisaborole ointment (EUCRISA®), and Otsuka's difamilast ointment (MOIZERTO®) [1] - Roflumilast cream and difamilast ointment are projected to have a combined global sales of approximately 254 million USD in 2024 [1] - Crisaborole ointment has already been approved for sale in the domestic market [1]