Database: toxicology
Question: What is the percentage of double bonds in the molecule TR008? Please provide your answer as a percentage with five decimal places.
SQL: SELECT ROUND(CAST(COUNT(CASE WHEN T.bond_type = '=' THEN T.bond_id ELSE NULL END) AS REAL) * 100 / COUNT(T.bond_id),5) FROM bond AS T WHERE T.molecule_id = 'TR008'