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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Oscillatoria B03.280.650 Plectonema B03.280.697 Spirulina B03.280.745 Synechococcus B03.280.750 Synechocystis ... 673 Quartz Crystal Microbalance Techniques E05.978.808 Reference Standards E05.978.808.249 Fiducial Markers E05. ...
  2. Drugs and Lactation Database (LactMed®) - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK501922
    ... Sotalol Sotatercept Sotorasib Sotrovimab Sparfloxacin Spesolimab Spinosad Spironolactone Spirulina St. John's Wort Stavudine Stevia Stinging Nettle Stiripentol ...