My undergrad education included biochem in our biology sequence but did not have a course called biochem. Additionally, my senior thesis was very biochemistry heavy. This was explained in one of my letters of req- basically arguing that I did have a good background in biochemistry. It has been about 50/50 on whether schools accept this, and I have found the only way to find out for sure is to call or email. If you are in a similar situation where you have the background but just not the course, it may be worth looking into this. If you are not familiar with the content of Orgo 2, I am not really sure why admissions would be persuaded to wave a pre-req.