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Identify compounds of biochemical compounds?

Please help! Many thanks!! :)

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  • 1 week ago
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    a) is a steroid. The 4-ring structure is the key.

    b) is a prostaglandin. The 5-member ring with long unsaturated hydrocarbons is a clue.

    c) is an alpha-ketofuranose ring formed from a ketohexose.

    d) is a terpene

    e) is a lecithin. The two fatty acids esterified to glycerol with a phosphate and an ethanolamine group identify it.

    f) This is an amino acid in its cationic form. 

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