That's a big transaction log. Is that included in the 805GB or do you have 805GB data file and 740GB log file? I wouldn't shrink the database apart from in a truly exceptional situation, and even then it will probably cause unpleasant side effects. But it looks like you could shrink that log file a lot unless you regularly do some massive updates and you actually need that much log space. Are you running in full recovery mode without log backups by any chance?