exhibit 2. 1 execution version privileged and confidential certain identified information has been excluded from the exhibit because it is both ( i ) not material and ( ii ) would likely cause competitive harm to the company, if publicly disclosed. double asterisks denote omissions. asset purchase agreement by and between ptc therapeutics, inc. as buyer and bioelectron technology corporation, as seller dated as of october 1, 2019 this document is not intended to create nor will it be deemed to create a legally binding or enforceable offer, acceptance of an offer or agreement of any type or nature, unless and until agreed to and executed by all parties table of contents page article i sale and purchase of assets ; closing 1 1. 1sale and purchase of assets ; assumption of assumed liabilities. 1 1. 1 1. 1 sale and purchase of assets ; assumption of assumed liabilities. 1 sale and purchase of assets ; assumption of assumed liabilities. 1 1. 2pre - closing. 2 1. 2 1. 2 pre - closing. 2 pre - closing. 2 1. 3location and date. 2 1. 3 1. 3 location and date. 2 location and date. 2 1. 4closing deliveries. 2 1. 4 1. 4 closing deliveries. 2 closing deliveries. 2 1. 5allocation. 5 1. 5 1. 5 allocation. 5 allocation. 5 1. 6contingent payments. 5 1. 6 1. 6 contingent payments. 5 contingent payments. 5 article ii representations and warranties of seller 7 2. 1due organization. 2. 1 2. 1 due organization. due organization. 2. 2authorization ; no conflict. 8 2. 2 2. 2 authorization ; no conflict. 8 authorization ; no conflict. 8 2. 3financial statements. 8 2. 3 2. 3 financial statements. 8 financial statements. 8 2. 4absence of changes. 10 2. 4 2. 4 absence of changes. 10 absence of changes. 10 2. 5real property ; encumbrances. 10 2. 5 2. 5 real property ; encumbrances. 10 real property ; encumbrances. 10 2. 6environmental matters. 11 2. 6 2. 6 environmental matters. 11 environmental matters. 11 2. 7assets. 12 2. 7 2. 7 assets. 12 assets. 12 2. 8taxes.