Conceptual biochemistry/organic question

Question

Dipalmitoylphosphatidylcholine is the major component of a surfactant secreted into the lung alveoli (the “sacs” in your lungs which allow large amounts of surface area for oxygen and carbon dioxide to diffuse through readily). Infants born prematurely often lack enough of this surfactant and therefore don’t readily absorb enough oxygen for survival, a condition known as “respiratory distress syndrome.”

1) Draw the structure of dipalmitoylphosphatidylcholine, knowing that palmitic acid is a completely saturated C16 fatty acid and choline has the structure -CH2CH2N+(CH3)3.

Answer 1

CH₃(CH₂)₁₄COO-CH₂-CH(OOC(CH₂)₁₄CH₃)-CH₂-O-PO(O^-)-O-CH₂-CH₂-N⁺(CH₃)₃

or

CH₃(CH₂)₁₄COO-CH₂-CH(O-PO(O^-)-O-CH₂-CH₂-N⁺(CH₃)₃)-CH₂-OOC(CH₂)₁₄CH₃