The affix ṭhañ comes after the words saṃtāpa etc. in the Dative -4th Case in construction in the sense of 'what is able to effect that'.,
The word प्रभवति means 'able, capable'. The dative here has the force of अलम् 2.3.16. As, संतापाय प्रभवति = सांतापिकः, सान्नाहिकः ॥
1 संताप, 2 संनाह, 3 संग्राम, 4 संयोग, 5 संपराय, 6 संवेशन, 7 संपेष, 8 निष्पेष, 9 सर्ग, 10 निसर्ग, 11 विसर्ग, 12 उपसर्ग, 13 प्रवास, 14 उपवास, 15 संघात, 16 संवेष, 17 संवास, 18 संमोदन, 19 सक्तु, 20 मांसौदनाद्विगृहीतादपि, 21 असर्ग. ॥,