抗坏血酸

• 土(earth; soil; land)RADICAL
• 不(not; negation)PHONETIC

Earth covered, denied, damaged and crumbles into fragments.

• 皿(bowl; dish)RADICAL
• 丿(drop of blood; blood drop)ASSOCIATIVE

Blood is a small red drop of liquid flowing down into a bowl—picturing blood dripping into a vessel.

• 酉(wine vessel; ferment)RADICAL
• 夋(slow manner; leisurely pace)PHONETIC

Fermenting alcohol produces sourness, which is exactly the character for sour.