‘ChemXtract’ A System for Extraction of Chemical Events from Patent Documents Pattabhi RK Rao author Sobha Lalitha Devi author 2023-09 text Proceedings of the 14th International Conference on Recent Advances in Natural Language Processing Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd., Shoumen, Bulgaria Varna, Bulgaria conference publication rk-rao-lalitha-devi-2023-chemxtract https://aclanthology.org/2023.ranlp-1.106/ 2023-09 988 995