GSK199 analog hydrochloride belongs to a class of compounds that inhibit PAD4 (guanidinoarginine deiminase 4). GSK199 analog hydrochloride has potential uses in diseases including rheumatoid arthritis, vasculitis, systemic lupus erythematosus, ulcerative colitis, cancer , cystic fibrosis, asthma, cutaneous lupus erythematosus, and psoriasis.