RxNorm Extension duplicative concepts share the same concept_name and other attributes

[yongqunh]

An issue we found is multiple RxNorm concept IDs having the same concept names:

CONCEPT ID CONCEPT NAME
41407309 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution [Pneumovax 23] Box of 10 by Abacus Medicine
44197230 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution [Pneumovax 23] Box of 10 by Abacus Medicine
41409432 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 1 by European
44197090 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 1 by European
41409257 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 10 by European
44197144 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 10 by European
41408115 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 20 by European
44197205 0.5 ML pneumococcal capsular polysaccharide type 1 vaccine 1.15 MG/ML Injectable Solution Box of 20 by European
41334016 1 ML Hepatitis A Vaccine (Inactivated) Strain HM175 720 UNT/ML / Hepatitis B Surface Antigen Vaccine 0.02 MG/ML Prefilled Syringe [Twinrix] Box of 10 by Abacus Medicine
44189840 1 ML Hepatitis A Vaccine (Inactivated) Strain HM175 720 UNT/ML / Hepatitis B Surface Antigen Vaccine 0.02 MG/ML Prefilled Syringe [Twinrix] Box of 10 by Abacus Medicine
41334010 1 ML Hepatitis B Surface Antigen Vaccine 0.02 MG/ML Prefilled Syringe Box of 1 by European
44189839 1 ML Hepatitis B Surface Antigen Vaccine 0.02 MG/ML Prefilled Syringe Box of 1 by European
36064699 Tick-borne encephalitis virus inactivated Injectable Suspension [TicoVac]
36964542 Tick-borne encephalitis virus inactivated Injectable Suspension [Ticovac]

If the above is true, we may need to do some cleanup and obsolete duplicate IDs.