Hey guys,
I'm also from UCLA, and I came across the same problem last month while filling out my secondaries. From the looks of it, you probably took the Chem 14 series like I did, and for god knows what reason, Chem 14BL is only 3 units! Anyways, I called some of the schools (I remember Dartmouth & Pitt, specifically), and they are well aware of UCLA's series (since I guess UCLA generates a lot of med applicants every year).
For the general chem. category, Dartmouth told me to include 14A, 14BL, Biochem. 153A, and Biochem. 153L (weird, I know). For organic chem, put down: 14B, 14C, 14D, 14CL.
The lady from Pitt basically said "ah yes...UCLA has that weird chem series. you're fine. just submit it."
Since it really depends on the school, just give them a call. Just wanted to let you know that this is not a big deal & don't stress out too much. After all, most pre-meds at UCLA take the wussy 14 series instead of 20, so I'm sure all the schools have seen it already. 👍