Chapter 23, Problem 61P

A chiral amine A having the $R$ configuration undergoes Hofmann elimination to form an alkene B as the major product. B is oxidatively cleaved with ozone, followed by ${\text{CH}}_{\text{3}}{\text{SCH}}_{\text{3}}$, to form ${\text{CH}}_{\text{2}}=\text{O}$ and ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{CHO}$. What are the structures of A and B?