It's something new made by LNK International and sold over the counter.
According to one poster, it is generic Mucinex (guaifenesin), an expectorant. See this post:
http://www.drugs.com/forum/topic.asp?TOPIC_ID=17596
I can't confirm the info at this time with a professional database, but it makes sense since there are many new generics of Mucinex recently approved by the FDA.
I'm not a pharmacist or a medical doctor. This message is not medical advice nor is it an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.