1. Resources to answer your first question:

• Chemical structure or formula:
  • Access Medicine: DRUGS (in top blue menu)
  • The Merck Index RS51 .M4 2001
  • Physicians' Desk Reference (PDR) RS75 .P5 2006
  • ChemFinder.Com - free
  • National Library of Medicine: Chemical Information - free
• Action in the body:
  • Access Medicine: DRUGS (in top blue menu)
  • The Merck Index RS51 .M4 2001
  • Physicians' Desk Reference (PDR) RS75 .P5 2006

2. Resources to answer your second question:

• Recent research & species tested:
  • MEDLINE
  • Google Scholar - free
  • Academic Search Complete
  • Biological Abstracts
• Definitions of unfamiliar words:
  • Oxford Reference Online, Medicine
  • Stedman's medical dictionary for the health professions and nursing  R121 .S8 2005
  • Taber's cyclopedic medical dictionary R121 .T18 2001
  • Medline Plus Medical Dictionary - free
  • Medicine.Net MedTerms Dictionary - free