Amino Acid For Liver Detox?

I remember there being a discussion in the AAS forum about liver detox, and a particular Amino Acid was touted as being excellent in this capacity. For the life of me I can't remember what it was called. My attempts to search the answer out have been futile. Does someone have an idea of what I'm talking about? Thanks.

Found it: N Acetyl Cysteine

Thanks though.