Diagnostic agents, preparations and substances for medical and surgical purposes; Diagnostic agents, preparations and substances for medical purposes, namely, the enhancing of adenomatous, cancerous and other proliferative lesions in the colon for patients undergoing colonoscopy and for the visualization of colonic adenoma in patients undergoing screening colonoscopy including patients at high risk of colorectal carcinoma (CRC), including those with previous history of polyps at prior colonos...