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【单选题】
防治禽流感病毒是目前人类面临的一个重大课题．八角茴香属于草本植物，是我国民间常用做烹凋的香料．医学研究成果显示．从八角茴香中可提取到莽草酸，莽草酸有抗炎、镇痛作用，也是合成对禽流感病毒有一定抑制作用的一种药物“达菲”的前体．莽草酸的结构为下列关于莽草酸的说法正确的是（　　）
A.
莽草酸的分子式为C 7 H 4 0 5
B.
莽草酸的分子之间可能发生酯化反应
C.
莽草酸分子结构中含有苯环
D.
莽草酸不能使溴水褪色
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