Declension table of ?upamantrin

Neuter	Singular	Dual	Plural
Nominative	upamantri	upamantriṇī	upamantrīṇi
Vocative	upamantrin upamantri	upamantriṇī	upamantrīṇi
Accusative	upamantri	upamantriṇī	upamantrīṇi
Instrumental	upamantriṇā	upamantribhyām	upamantribhiḥ
Dative	upamantriṇe	upamantribhyām	upamantribhyaḥ
Ablative	upamantriṇaḥ	upamantribhyām	upamantribhyaḥ
Genitive	upamantriṇaḥ	upamantriṇoḥ	upamantriṇām
Locative	upamantriṇi	upamantriṇoḥ	upamantriṣu

Compound upamantri -

Adverb -upamantri