pentamethylenetetrazol vs pentylenetetrazol

pentamethylenetetrazol and pentylenetetrazol both are nouns.

Word	Noun	Adjective	Verb	Adverb
pentamethylenetetrazol	Yes	No	No	No
pentylenetetrazol	Yes	No	No	No

As nouns, pentamethylenetetrazol and pentylenetetrazol are synonyms defined as:

pentamethylenetetrazol and pentylenetetrazol: a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark

Other synonyms of pentamethylenetetrazol include Metrazol.

pentamethylenetetrazol (noun)	pentylenetetrazol (noun)
a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark	a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark