Hi There, I have just googled what you have described and this came up U-4700 (Pink) U-47700, also known as “Pink”, “Pinky”, or “U4” on the streets, is a potent, synthetic opioid medication. Here is the link https://www.drugs.com/illicit/u-47700.html. I’m not sure if that is what it is but if you take a look you would know as you have seen it. If it’s not if you haven’t already take a look on the internet and see if you can match it to anything, hope this helps.