Database: toxicology
Question: Among all the atoms from 21 to 25, list all the molecules that are carcinogenic.
SQL: SELECT DISTINCT T2.molecule_id FROM atom AS T1 INNER JOIN molecule AS T2 ON T1.molecule_id = T2.molecule_id WHERE SUBSTR(T1.atom_id, -2) BETWEEN '21' AND '25' AND T2.label = '+'