Dīng'èrxī yǒudú, gōngren jiēchù shí bìxū zuòhǎo fánghù.
Butadiene is toxic, so workers must be properly protected when they handle it.
Tips
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The name decodes itself: 丁 means four carbons, 二 two, and 烯 a double bond, so a four-carbon chain with two double bonds. Combined with 苯乙烯 (styrene) it makes 丁苯橡胶, the most common synthetic rubber, used in car tyres.
