Tryptamine analogues

A compound of Formula (I) wherein:

• R1 is selected from H or C1-6 alkyl;
• and
• R2 is CH2—CHR4—NR5R6, wherein
• R4 is selected from H or C1-6 alkyl, wherein
• R5 is selected from H or C1-6 alkyl, wherein
• R6 is:
• d)
• wherein X is a bond, Y is N, Z is O and R7 and R8 together from a bringing group CH2CH2;
• or
• e)
• wherein X is NH or O, Y is CH, Z is O and R7 and R8 are H;
• or
• f) NH(CH2)3N(CH3)2, O(CH2)OH or O(CH2)2N(CH3)2
• R3 is selected from H or L-R9, wherein
• L is selected from O, N, NH, O—O, CH2, CH2CH2, O—O—CH2CH2, CO, OCO, COO or OCONH,
• wherein
• R9 is selected from H, C1-6 alkyl, COOH, OH, COO−, O−, C6-C10 aromatic, C3-C10 heteroaromatic or heterocyclic group comprising one, two or three heteroatoms independently selected from O and N;
• and
• K is CH;
• or is a pharmaceutically acceptable salt thereof.