NLM-Chem-BC7: manually annotated full-text resources for chemical entity annotation and indexing in biomedical articles. - Rezarta Islamaj; Robert Leaman; David Cissel; Cathleen Coss; Joseph Denicola; Carol Fisher; Rob Guzman; Preeti Gokal Kochar; Nicholas Miliaras; Zoe Punske; Keiko Sekiya; Dorothy Trinh; et al. (Database J. Biol. Databases Curation, 2022)