        JOIN devv5.concept_ancestor ON ancestor_concept_id = a.concept_id
        JOIN concept c
             ON c.concept_id = descendant_concept_id AND c.vocabulary_id like 'RxNorm%' AND c.standard_concept = 'S'
-WHERE descendant_concept_id NOT IN (SELECT concept_id FROM сlass_to_rx_descendant);
+WHERE descendant_concept_id NOT IN (SELECT concept_id FROM class_to_rx_descendant);
 
 -- 4.5
-INSERT INTO сlass_to_rx_descendant
+INSERT INTO class_to_rx_descendant
 SELECT DISTINCT substring(concept_code_1, '\w+'),
                 class_name,
                 c.concept_id,

       JOIN devv5.concept_ancestor ON ancestor_concept_id = a.concept_id
       JOIN concept c
            ON c.concept_id = descendant_concept_id AND c.vocabulary_id like 'RxNorm%' AND c.standard_concept = 'S'
WHERE descendant_concept_id NOT IN (SELECT concept_id FROM сlass_to_rx_descendant);

--4.6
INSERT INTO сlass_to_rx_descendant
SELECT DISTINCT substring(concept_code_1, '\w+'),
                class_name,
                c.concept_id,

       JOIN concept c
            ON c.concept_id = descendant_concept_id AND c.vocabulary_id like 'RxNorm%' AND c.standard_concept = 'S'
       JOIN drug_strength d ON d.drug_concept_id = c.concept_id
WHERE descendant_concept_id NOT IN (SELECT concept_id FROM class_to_rx_descendant)
  AND NOT exists
  (SELECT 1
   FROM concept c2
