Abstract: The present invention relates to a compound according to formula (1) wherein n is 0, 2, 4 or 6 and a, b and c are, independently of one another, 1 or 0. R1-1a, R1-1b and R1-1c are hydrogen, a hydrocarbyl containing 1 to 10 carbon atoms which are alkyl, aryl, alkylene, arylalkyl or alkylaryl or a hydrocarbyl containing 1 to 10 carbon atoms and at least one heteroatom which can be oxygen, sulfur or nitrogen. R2-1a, R3-1a, R4-1a, R5-1a, R2-1b, R3-1b, R4-1b, R5-1b, R2-1c, R3-1c, R4-1c and R5-1c hydrogen or C1-C4alkyl. R6-1a, R7-1a, R6-1b, R7-1b, R6-1c and R7-1c are C1-C4akyl. A is an aromatic or alicyclic ring having 5 to 7 carbon atoms. The present invention further relates to a Mannich base reaction product obtained by combining an extract from cashew nutshell liquid with at least one aromatic or alicylic polyamine and at least one aldehyde compound, epoxy resin compositions and curable formulations containing the same, and methods for using such compositions.