DrugTrail: Interpretable Drug Discovery via Structured Reasoning and Druggability‑Tailored Preference Optimization - Liu, Yurou; Li, Mingyang; Zhu, Xinyuan; Jiao, Rui; Dong, Yiming; Tang, Xinyu; Liu, Yang; Ye, Jieping; Su, Bing; Wang, Zheng (International Conference on Learning Representations, 2026)