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  1. Appendix 1 - RxNorm Relationships (RELA) 
    https://www.nlm.nih.gov/research/umls/rxnorm/docs/appendix1.html
    ... Tylenol' IN part_of MIN 'Acetaminophen' part_of 'Acetaminophen / Diphenhydramine' IN has_form PIN 'Diphenhydramine' has_form 'Diphenhydramine ... TTY Example with Strings MIN has_part IN 'Acetaminophen / Diphenhydramine' has_part 'Acetaminophen' MIN has_part PIN 'Glucosamine ...
  2. RxNorm Overview 
    https://www.nlm.nih.gov/research/umls/rxnorm/overview.html
    ... 325 MG Oral Tablet [Tylenol] Acetaminophen part_of Acetaminophen / Diphenhydramine Acetaminophen 325 MG Oral Tablet [Tylenol] has_dose_ ...
  3. MedlinePlus Drug Information: Diphenhydramine 
    https://medlineplus.gov/druginfo/meds/a682539.html
    ... M. Aspirin Free® (as a combination product containing Acetaminophen, Diphenhydramine)¶ ... Excedrin PM® (as a combination product containing Acetaminophen, Diphenhydramine)
  4. MedlinePlus Drug Information: Phenylephrine 
    https://medlineplus.gov/druginfo/meds/a606008.html
    ... PE Severe Cold® (as a combination product containing Acetaminophen, Diphenhydramine, Phenylephrine) ... Cold and Cough® (as a combination product containing Acetaminophen, Diphenhydramine, Phenylephrine)