Pāṇini sūtras

In compound words ending in añc, the final vowel of the preceding word has the acute accent in the weak cases in which only c of añc remains.

German In den auf śrañc ausgehenden Wörtern hat der Endvocal des vorangehenden Wortes den Acut in den schwächsten Casus (in denen nur c übrigbleibt). (222)

1. cauचौ

   Part	Lexeme	Sandhi form	Stem + termination
   cच्	cuचु	cauचौ	cच् + plus auऔ

Anuvṛtti

1. antaḥअन्तः 6·1·220

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	antaअन्त	antaḥअन्तः	last syllable	antअन्त् + plus aḥअः