Clinical Study to Evaluate the Efficacy and Safety of GNS-212-E in Bowel Preparation for Colonoscopy

Subjects who are randomized into this group will take GNS-212-E1 from the evening before colonoscopy to the morning of colonoscopy.

Subjects who are randomized into this group will take GNS-212-E2 from the evening before colonoscopy to the morning of colonoscopy.

Subjects who are randomized into this group will take active control drug (PEG3350) from the evening before colonoscopy to the morning of colonoscopy.