Declension table of ?aupasthya

Neuter	Singular	Dual	Plural
Nominative	aupasthyam	aupasthye	aupasthyāni
Vocative	aupasthya	aupasthye	aupasthyāni
Accusative	aupasthyam	aupasthye	aupasthyāni
Instrumental	aupasthyena	aupasthyābhyām	aupasthyaiḥ
Dative	aupasthyāya	aupasthyābhyām	aupasthyebhyaḥ
Ablative	aupasthyāt	aupasthyābhyām	aupasthyebhyaḥ
Genitive	aupasthyasya	aupasthyayoḥ	aupasthyānām
Locative	aupasthye	aupasthyayoḥ	aupasthyeṣu

Compound aupasthya -

Adverb -aupasthyam -aupasthyāt