There are quite a few UK and European based companies selling genuine 1-AD and 4-AD as in the diols. There are a few US outlets too but obviously they're pretty quiet, usually easier to just import from the UK/Europe. I've tried the Androtech Labs products, 1-AD and 4-AD under different names and there was a Pacific Coast 1-AD but I think they got shut down by Ergopharm for copying the look but they definitely all worked just like the old stuff.