Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes '(-)-voacangine(1+)'?

A. An ammonium ion derivative resulting from the protonation of the tertiary amino group of (-)-voacangine. The major species at pH 7.3.
B. An organic cation obtained by protonation of one of the two free amino groups of 2-deoxystreptamine.
C. An organic cation obtained by protonation of the tertiary amino function of neopikromycin; major species at pH 7.3.
D. An ammonium ion resulting from the addition of two protons to the free base of PF-670462.

Answer: An ammonium ion derivative resulting from the protonation of the tertiary amino group of (-)-voacangine. The major species at pH 7.3.