TASK: the task is to extract chemical entities in a sentence.

INPUT: the input is a sentence.

OUTPUT: the output is an HTML that highlights all the chemical entities with <span> ... </span> in the sentence.

The following example format is provided:

Example-1 Sentence: Iatrogenically induced intractable atrioventricular reentrant tachycardia after verapamil and catheter ablation in a patient with Wolff - Parkinson - White syndrome and idiopathic dilated cardiomyopathy .

HTML: Iatrogenically induced intractable atrioventricular reentrant tachycardia after <span> verapamil </span> <span> and catheter ablation in a patient with Wolff - Parkinson - White syndrome and idiopathic dilated cardiomyopathy .

Example-2 Sentence: Variant ventricular tachycardia in desipramine toxicity .

HTML: Variant ventricular tachycardia in <span> desipramine </span> <span> toxicity .

Example-3 Sentence: We report a case of variant ventricular tachycardia induced by desipramine toxicity .

HTML: We report a case of variant ventricular tachycardia induced by <span> desipramine </span> <span> toxicity .

Example-4 Sentence: Procainamide - induced polymorphous ventricular tachycardia .

HTML: <span> Procainamide </span> <span> - induced polymorphous ventricular tachycardia .

Example-5 Sentence: In a patient with WPW syndrome and idiopathic dilated cardiomyopathy , intractable atrioventricular reentrant tachycardia ( AVRT ) was iatrogenically induced .

HTML: In a patient with WPW syndrome and idiopathic dilated cardiomyopathy , intractable atrioventricular reentrant tachycardia ( AVRT ) was iatrogenically induced .

Sentence: {Input}

HTML: 