Used in a medical journal,this "name" contains over 1900's characters (letters).What is it about?

Is it the chemical name of some organic compound?

I was expecting an answer in a different form but I guess you are right Professor.My question was aiming towards a general form of answer.

methionylglutaminylarginyltyrosylglutamylserylleucyl phenylalanylalanylglutaminylleucyllysylglutamylarginyl lysylglutamylglycylalanylphenylalanylvalylprolylphenyl alanylvalylthreonylleucylglycylaspartylprolylglycylisol eucylglutamylglutaminylserylleucyllysylisoleucylaspartyl threonylleucylisoleucylglutamylalanylglycylalanylaspartyl alanylleucylglutamylleucylglycylisoleucylprolylphenyl alanylserylaspartylprolylleucylalanylaspartylglycylprolyl threonylisoleucylglutaminylasparaginylalanylthreonylleucyl arginylalanylphenylalanylalanylalanylglycylvalylthreonyl prolylalanylglutaminylcysteinylphenylalanylglutamyl methionylleucylalanylleucylisoleucylarginylglutaminyllysyl histidylprolylthreonylisoleucylprolylisoleucylglycylleucyl leucylmethionyltyrosylalanylasparaginylleucylvalylphenyl alanylasparaginyllysylglycylisoleucylaspartylglutamylphenyl alanyltyrosylalanylglutaminylcysteinylglutamyllysylvalyl glycylvalylaspartylserylvalylleucylvalylalanylaspartylvalyl prolylvalylglutaminylglutamylserylalanylprolylphenylalanyl arginylglutaminylalanylalanylleucylarginylhistidylasparaginyl valylalanylprolylisoleucylphenylalanylisoleucylcysteinyl prolylprolylaspartylalanylaspartylaspartylaspartylleucyl leucylarginylglutaminylisoleucylalanylseryltyrosylglycyl arginylglycyltyrosylthreonyltyrosylleucylleucylserylarginyl alanylglycylvalylthreonylglycylalanylglutamylasparaginyl arginylalanylalanylleucylprolylleucylasparaginylhistidyl leucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginyl alanylalanylprolylprolylleucylglutaminylglycylphenylalanyl glycylisoleucylserylalanylprolylaspartylglutaminylvalyllysyl alanylalanylisoleucylaspartylalanylglycylalanylalanylglycyl alanylisoleucylserylglycylserylalanylisoleucylvalyllysylisol eucylisoleucylglutamylglutaminylhistidylasparaginylisoleucyl glutamylprolylglutamyllysylmethionylleucylalanylalanylleucyl lysylvalylphenylalanylvalylglutaminylprolylmethionyllysyl alanylalanylthreonylarginylserine. This is the full name, 1,913 characters long, for tryptophan synthetase, a protein, which has 267 amino acids in it. I extracted this monster from The Word Lover’s Dictionary by Josefa Heifetz, but it is also cited in Mrs Byrne’s Dictionary of Unusual, Obscure, and Preposterous Words by the same author. If you want to break it down into its components, it consists of many repetitions of the adjectival forms of the names of amino acids, such as alanyl, methionyl, threonyl, and valyl, all of which end in yl, with one instance of serine at the end.

Another link

That will be the name of my next "pet alligator"

That chemical name, as your monster link points out, appeared in publication in 1960 and is quaint and contrived by today's standards. The twenty amino acids that naturally occur in proteins were assigned three-letter codes (Alanine = ALA; Arginine = ARG; etc), and then more recently the IUPAC (International Union of Pure and Applied Chemistry) has assigned them one-letter codes: Alanine = A; Arginine = R; etc.

In this case, "methionylglutaminylarginyltyrosyl...serine" would become "MQRY...S" (Source: Bioinformatics for Dummies)

In all, the monster name could be reduced (without ambiguity) from 1,913 letters to 267 letters, i.e., the number of amino acids in the protein.

Intersting piece of trivia, however.