1. Its sedative properties were first published in 1869 and subsequently, because of its easy synthesis, its use was widespread.

इसकी शामक गुण पहली बार 1869 में प्रकाशित हुए थे और बाद में, इसके आसान संश्लेषण के कारण, इसका उपयोग व्यापक था।