I assume that a lot of the inactive substance is going to be plant matter like chlorophyll. Poppy Straw is defined as all parts of the poppy after mowing, save for the seeds. So, even if it is "concentrated" I would imagine the proportions of the concentrate are still going to contain a lot of plant material, otherwise it would just be Morphine, right? There are probably other alkaloids in there like Codeine, Thebaine and maybe some others depending upon the variety of poppy and growing conditions.