At the climax of the book, Grenouille murders a young virgin woman and creates a purfume with her scent. Unlike any part before this, Grenouille's sense of smell was only ever seem as a flaw.
Scent is used numerous times as a metaphor for power or class, and all things good or beautiful in general. The Symbol of scent in Perfume is one's character and who they are, so of course Grenouille, lacking such a crucial trait, had ultimately meant that he had no sense identity to himself or others. Just like class or social status, he was seen as unimpressive or unattractive simply because of his inherant disanvantage. On the other hand, the most desirable were mostly innocent, which Grenouille himself was not.
Grenouille struggled with his own desertion the moment he was born, (being discarded after his mother realised he had not sent), but also with how he is treated by others that know of his incredible sense of smell. What would typically be seen as a “gift” was then a reason for those who knew him personally to call Grenouille demonic.
Making perfume gave Grenouille purpose, but also meant that he had to kill. His undeniable scorn for humanity only further justified the murders by fulfilling both his need for purpose and control.
Paris is the capital of France.
Tokyo is the capital of Japan.