1. Pfizer signed a $2.1 billion licensing deal for an obesity pill with YaoPharma. 2. The deal includes a $150 million upfront payment and future milestone payments. 3. YaoPharma's pill targets the GLP-1 hormone, similar to Novo Nordisk's Wegovy. 4. The weight loss drug market could be worth $100 billion by the 2030s. 5. Analysts view this diversification as promising for Pfizer's pipeline.