* mb_substr never returns false, it will return an empty string instead. * * calculating the number of characters in the string is a relatively expensive operation, so * we only carry it out when necessary. It isn't necessary for +ve offsets and no specified length */ // cast paramete...
The IR spectrum displayed absorption bands for a carboxylic acid group (3215 cm´1, 1678 cm´1) and a keto function at 1735 cm´1 and unsaturation at 1643 cm´1. The HRESIMS showed a molecular ion at m/z 502.3290 [M]+, 479.1023 [M ´ 23]+, 453.0885 [M ´ CH3OH ´ ...