User blog comment:Chriskim98/Ask Chriskim98!/@comment-11502729-20140324063448/@comment-3563130-20140324114142

No it isn't, the chemical name of titin (Methionylthreonylthreonylglutaminylarginyl...isoleucine) is, with 189,819 letters.

Not to mention that you spelled it wrong, it's pneumonoultramicroscopicsilicovolcanoconiosis