c1ccccc1
Reaction SMIRKS %5BS%3A1%5D%5BC%3A2%5D%3D%5BO%3A3%5D%3E%3E%5BS%3A1%5D%5BH%5D.%5BC%3A2%5D%28O%29%3D%5BO%3A3%5D