【化】 巴比土酸
【医】 巴比土酸

[ noun ]
a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs
<noun.substance>

Barbituric acid \Bar`bi*tu"ric ac"id\ (Chem.)
A white, crystalline substance, {CH2(CO.NH)2.CO}, derived
from alloxantin, also from malonic acid and urea, and
regarded as a substituted urea.