There are actually many titles, as pharmacists get employed in many areas of research. So, you'll have to get more specific. Also, it'll depend on any other degrees that you have; you'll have more opportunities with a graduate degree (MS or PhD) as well...
I don't know if this will help, but here's what one person with a pharmacy background does in the industry as a researcher.
I still don't get your question. A PhD in chemistry can lead to lots of things. Your doctoral research and area of interest will lead you to the area you want to specialize in. A person with a PhD in chemistry can work in gas & oil production as well as pharmaceutics & biopharmaceutics, fuel cells, solid state chemistry & a whole bunch of other chemistry related fields.
As for the actual title....that is company specific. Some like "research associate", "medicinal chemist", "research & development chemist", etc...can go on and on...
If you're interested specifically in Pfizer...go onto their website & browse their job openings & research staff.