mumbai a city couple who recently shifted to kerala has received rs 1531 crore from an anonymous donor to purchase a lifesaving drug for the treatment of their 16monthold sonmarine engineer sarang menon and adithi nairs son nirvaan was diagnosed with spinal muscular atrophy sma type 2 a rare disease for which a key onetime drug costs almost rs 173 crore donations began pouring in after a crowdfunding page was started on milaaporg but the identity of the person who gave 14 million or rs 1531 crore is unknown nair said the target set by menon was rs 1750 crorewe are happy that this contribution has taken us very close to our target i think we will manage to raise the remaining amount on our own as well as through relatives and friends she saidhowever it will take at least twothree weeks for us to take our son nirvaan back to mumbai due to some mandatory testing and the time required for arrival of the drug from the us to mumbai nair said nirvaans family has already initiated required communication with the union finance ministry and importexport department for necessary clearances for the drug dr neelu desai paediatric neurologist at hinduja hospital will be treating nirvaansma is a group of ailments in which specialised nerve cells in the brain and spinal cord also called motor neurons that control movement in arms legs face throat tongue get killed pti